The component with the lowest price in the CRANKCASE schematic is the Gasket(8.2x14x1) (nas).
Some items from this specific schematic: Bolt, Gasket(10.2x20x2).3 (nas), Gasket(16x22x2) (nas), Crankcase Set.
The Crankcase is made up of components including this Crankcase Set which is the most expensive.
